Thats assuming you are at least 10° or so retarded to start with, and you only end up at around 8° advanced from straight up, or in other words you are moving the cam 18°. Like I said, you need to see where you are to start with, before you assume you need to move the cam. Advancing a cam that much is a good way to bend valves. When you advance a cam, you lose intake valve clearance with the piston. Be careful, I wouldn't do as this person has done....
